Are you sure the JASSM is more stealth than the new ALCM AGM-129( Don´t remenber exactly the numer)? I thought that missile only launched by B-52 was much more advanced than the tatical ones like the JASSM.

JASSM is only 63% the size of ALCM. Its can be carried by more aircraft types.
ACM and ALCM is too large (3300 to 3600 pounds). But modified version of ACM and ALCM have MUCH longer range than even JASSM-Er, while also carying bigger warhead.
Nothing can substitute size.